[w3c/payment-request] Should we validate nonsense payer error properties? (#793)

If we have a payment request that has option: `{requestPayerEmail: false}`, then what should we do if the merchant asks to correct something that was not requested, like 

```JS
response.retry({payer: {email: "Lol, I never asked for your email."} })
```

Right now, the spec just says to ignore that. Should we maybe throw or just continue to ignore. The above also applies to some cases of `.updateWith()` (e.g., flagging shipping address errors when no shipping address was requested). 

cc @aestes, @rsolomakhin, @romandev. 

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